How much memory can you save with plain servlet container, like Tomcat comparing to full-blown application server tomee.apache.org (Plus)? (it is a popular FAQ). In this screencast I launched Tomcat, TomEE WebProfile and TomEE Plus and measured the total footprint (docker image + Java + server):
All images used in this screencast are available from: docklands.
Note: a 16 GB Server ECC RAM is currently available for 100 USD